That sounds like the clamp on my Bontrager/Titec post from 93.
It's hard to explain but there are two bolts, one has a knurled head and is adgusted with the fingers, this bolt goes through the cradles and screws into the hole in the top of the seatpost, and the other has a bolt which goes through the cradles and threads into an aluminium bit with a T-shape.
Takes ages to set up because you set the angle and then tighten it all down, find the angle is wrong, loosen it off so you can twist the knurled bolt with your finger, tighten it up again to find it's still wrong and go back to step one.
I've also had the head twist on mine but araldite has fixed it - not bad for a post from 93 that is still in use.
If it is like my one then if you really can't stand it I could either take it off your hands (27.0 or 27.2), or if you want me to I could take some pics to explain better.
He's not the messiah, he's a very naughty boy.
95 Kona Explosif Singlespeed/Fixie - 100% Thrashed since new and it's still very well loved (and it looks it).
Dave Lloyd C.A.T.S W.I.S.K.A.S - Built, ridden, loved, and sold.